Spring Boot2 + Mybatis 整合(Mybatis自动生成插件、分页插件)

版权声明：转载注明出处 https://blog.youkuaiyun.com/jy02268879/article/details/83065648

内容：

Spring Boot2 + Mybatis 整合

Mybatis Generator自动生成代码

Mybatis PageHelper分页插件

创建maven项目

修改pom.xml 注意springboot、druid、pageHelper的版本号

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
 
<groupId>com.sid</groupId>
<artifactId>springboot</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
 
 
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.5.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>
 
<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
</properties>
 
<dependencies>
    <!-- spring-boot的web启动的jar包 -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
 
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
 
    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-lang3</artifactId>
        <version>3.4</version>
    </dependency>
 
 
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>1.3.2</version>
    </dependency>
 
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.38</version>
    </dependency>
 
    <!-- alibaba的druid数据库连接池 -->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid-spring-boot-starter</artifactId>
        <version>1.1.9</version>
    </dependency>
 
    <!-- 分页插件-->
    <dependency>
        <groupId>com.github.pagehelper</groupId>
        <artifactId>pagehelper-spring-boot-starter</artifactId>
        <version>1.2.5</version>
    </dependency>
 
 
</dependencies>
 
<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
 
        <!-- mybatis generator 自动生成代码插件 -->
        <plugin>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-maven-plugin</artifactId>
            <version>1.3.2</version>
            <configuration>
                <configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile>
                <overwrite>true</overwrite>
                <verbose>true</verbose>
            </configuration>
        </plugin>
 
    </plugins>
</build>
 
 
</project>

创建启动类App.java

package com.sid;
 
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
 
@SpringBootApplication
@MapperScan("com.sid.mapper")//将项目中对应的mapper类的路径加进来就可以了
public class App {
    public static void main(String[] args) {
        SpringApplication.run(App.class, args);
    }
}

创建application.yml

server:
  port: 8088
  servlet:
    context-path: /sid
 
spring:
  mvc:
   view:
    prefix: /
    suffix: .html
  datasource:
      url: jdbc:mysql://localhost:3306/sid
      username: root
      password: root
      # 使用druid数据源
      type: com.alibaba.druid.pool.DruidDataSource
      driver-class-name: com.mysql.jdbc.Driver
 
 
## 该配置节点为独立的节点，不是在在spring的节点下
mybatis:
  mapper-locations: classpath:mapping/*.xml  #注意：一定要对应mapper映射xml文件的所在路径
  type-aliases-package: com.sid.model  # 注意：对应实体类的路径
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl #控制台打印sql
 
#pagehelper分页插件
pagehelper:
  helperDialect: mysql
  reasonable: true
  supportMethodsArguments: true
  params: count=countSql
 
 

在resources/generator下创建文件generatorConfig.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
    <!-- 数据库驱动:选择你的本地硬盘上面的数据库驱动包-->
    <classPathEntry  location="F:\MySQL\Connector.J 5.1\mysql-connector-java-5.1.38-bin.jar"/>
    <context id="DB2Tables"  targetRuntime="MyBatis3">
        <commentGenerator>
            <property name="suppressDate" value="true"/>
            <!-- 是否去除自动生成的注释 true：是 ： false:否 -->
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>
        <!--数据库链接URL，用户名、密码 -->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/sid" userId="root" password="root">
        </jdbcConnection>
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>
        <!-- 生成模型的包名和位置-->
        <javaModelGenerator targetPackage="com.sid.model" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>
        <!-- 生成映射文件的包名和位置-->
        <sqlMapGenerator targetPackage="mapping" targetProject="src/main/resources">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>
        <!-- 生成DAO的包名和位置-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.sid.mapper" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>
        <!-- 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名-->
        <table tableName="user" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
    </context>
</generatorConfiguration>

项目目录

 

数据库中的表

CREATE TABLE `user` (
  `id` bigint(32) NOT NULL COMMENT '用户ID',
  `name` varchar(30) NOT NULL COMMENT '用户名',
  `password` varchar(30) NOT NULL COMMENT '密码',
  `mobile_phone` varchar(20) NOT NULL COMMENT '手机号',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

 

mybatis自动生成代码的插件使用方式

run

然会就会自动生成UserMapper.xml、 User.java 、UserMapper.java

 

UserController.java

package com.sid.controller;
 
import com.github.pagehelper.PageInfo;
import com.sid.model.User;
import com.sid.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
 
@Controller
@RequestMapping(value = "/user")
public class UserController {
 
   @Autowired
    private UserService userService;
 
    @ResponseBody
    @RequestMapping(value = "/add")
    public int addUser(User user){
        return userService.addUser(user);
    }
 
    @ResponseBody
    @RequestMapping(value = "/delete")
    public int deleteUser(String id){
        return userService.deleteUser(id);
    }
 
    @ResponseBody
    @RequestMapping(value = "/update")
    public int updateUser(User user){
        return userService.updateUser(user);
    }
 
    @ResponseBody
    @RequestMapping(value = "/selectAll")
    public PageInfo<User> selectAll(int pageNum, int pageSize){
        return userService.selectAll( pageNum,  pageSize);
    }
}

 

UserService.java

package com.sid.service;
 
import com.github.pagehelper.PageInfo;
import com.sid.model.User;
 
public interface UserService {
     int addUser(User user);
 
    int deleteUser(String id);
 
    int updateUser(User user);
 
    /*
     * pageNum 开始页数
     * pageSize 每页显示的数据条数
     * */
    PageInfo<User> selectAll(int pageNum, int pageSize);
}

UserServiceImpl.java

package com.sid.service.impl;
 
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.sid.mapper.UserMapper;
import com.sid.model.User;
import com.sid.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
 
import java.util.List;
 
@Service(value = "userService")
public class UserServiceImpl implements UserService {
 
       @Autowired
    private UserMapper userMapper;
 
    @Override
    public int addUser(User user) {
        return userMapper.insertSelective(user);
    }
 
    @Override
    public int deleteUser(String id) {
        return userMapper.deleteByPrimaryKey(id);
    }
 
    @Override
    public int updateUser(User user) {
        return userMapper.updateByPrimaryKey(user);
    }
 
    /*
     * pageNum 开始页数
     * pageSize 每页显示的数据条数
     * */
    @Override
    public PageInfo<User> selectAll(int pageNum, int pageSize) {
 
        PageHelper.startPage(pageNum, pageSize,"id desc"); //开始起始页
        List<User> userList = userMapper.selectAll(); // 获取数据
        PageInfo<User> page = new PageInfo<>(userList); // 实例化PageInfo
        return page;
    }
 
}

UserMapper.java

package com.sid.mapper;
 
import com.sid.model.User;
import org.springframework.stereotype.Component;
 
import java.util.List;
 
@Component
public interface UserMapper {
    int deleteByPrimaryKey(String id);
 
    int insert(User record);
 
    int insertSelective(User record);
 
    User selectByPrimaryKey(String id);
 
    int updateByPrimaryKeySelective(User record);
 
    int updateByPrimaryKey(User record);
 
 
    List<User> selectAll();
}

UserMapping.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.sid.mapper.UserMapper" >
  <resultMap id="BaseResultMap" type="com.sid.model.User" >
    <id column="id" property="id" jdbcType="BIGINT" />
    <result column="name" property="name" jdbcType="VARCHAR" />
    <result column="password" property="password" jdbcType="VARCHAR" />
    <result column="mobile_phone" property="mobilePhone" jdbcType="VARCHAR" />
  </resultMap>
  <sql id="Base_Column_List" >
    id, name, password, mobile_phone
  </sql>
  <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Long" >
    select 
    <include refid="Base_Column_List" />
    from user
    where id = #{id,jdbcType=BIGINT}
  </select>
 
  <select id="selectAll" resultMap="BaseResultMap"  >
    select
    <include refid="Base_Column_List" />
    from user
  </select>
 
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Long" >
    delete from user
    where id = #{id,jdbcType=BIGINT}
  </delete>
  <insert id="insert" parameterType="com.sid.model.User" >
    insert into user (id, name, password, 
      mobile_phone)
    values (#{id,jdbcType=BIGINT}, #{name,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR},
      #{mobilePhone,jdbcType=VARCHAR})
  </insert>
  <insert id="insertSelective" parameterType="com.sid.model.User" >
    insert into user
    <trim prefix="(" suffix=")" suffixOverrides="," >
      <if test="id != null" >
        id,
      </if>
      <if test="name != null" >
        name,
      </if>
      <if test="password != null" >
        password,
      </if>
      <if test="mobilePhone != null" >
        mobile_phone,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides="," >
      <if test="id != null" >
        #{id,jdbcType=BIGINT},
      </if>
      <if test="name != null" >
        #{name,jdbcType=VARCHAR},
      </if>
      <if test="password != null" >
        #{password,jdbcType=VARCHAR},
      </if>
      <if test="mobilePhone != null" >
        #{mobilePhone,jdbcType=VARCHAR},
      </if>
    </trim>
  </insert>
  <update id="updateByPrimaryKeySelective" parameterType="com.sid.model.User" >
    update user
    <set >
      <if test="name != null" >
        name = #{name,jdbcType=VARCHAR},
      </if>
      <if test="password != null" >
        password = #{password,jdbcType=VARCHAR},
      </if>
      <if test="mobilePhone != null" >
        mobile_phone = #{mobilePhone,jdbcType=VARCHAR},
      </if>
    </set>
    where id = #{id,jdbcType=BIGINT}
  </update>
  <update id="updateByPrimaryKey" parameterType="com.sid.model.User" >
    update user
    set name = #{name,jdbcType=VARCHAR},
      password = #{password,jdbcType=VARCHAR},
      mobile_phone = #{mobilePhone,jdbcType=VARCHAR}
    where id = #{id,jdbcType=BIGINT}
  </update>
</mapper>

User.java

package com.sid.model;
 
public class User {
    private Long id;
 
    private String name;
 
    private String password;
 
    private String mobilePhone;
 
    public Long getId() {
        return id;
    }
 
    public void setId(Long id) {
        this.id = id;
    }
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name == null ? null : name.trim();
    }
 
    public String getPassword() {
        return password;
    }
 
    public void setPassword(String password) {
        this.password = password == null ? null : password.trim();
    }
 
    public String getMobilePhone() {
        return mobilePhone;
    }
 
    public void setMobilePhone(String mobilePhone) {
        this.mobilePhone = mobilePhone == null ? null : mobilePhone.trim();
    }
}

添加11条数据到数据库中

查询

结果

打开mybatis执行的SQL打印会在后台看见

还是执行了一次select count(0)